Javascript 参考手册尝试一下

<!DOCTYPE html>
<html>
<head>

/*Safari 和 Chrome*/
-webkit-animation:mymove 2s infinite;
-webkit-animation-play-state:paused;
}

@keyframes mymove
{
from {left:0px;}
to {left:200px;}
}

@-webkit-keyframes mymove /*Safari 和 Chrome*/
{
from {left:0px;}
to {left:200px;}
}

</style>

</head>
<body>

<p>点击按钮播放/暂停动画：</p>

function myPauseFunction()
{
document.getElementById("myDIV").style.animationPlayState = "paused";
document.getElementById("myDIV").style.WebkitAnimationPlayState = "paused"; // 针对 Chrome 和 Safari 的代码
}
</script>

<p><strong>注意：</strong>Internet Explorer 9 及其之前的版本不支持 animationPlayState 属性。</p>

</body>
</html>